[1] Univ Leeds, St Gemmas Acad Unit Palliat Care, Leeds, W Yorkshire, England
[2] Inst Pain Med, Pain Res Unit, Rambam Hlth Care Campus, Haifa, Israel
[3] Technion Israel Inst Technol, Haifa, Israel
[4] Univ Sheffield, Sheffield, S Yorkshire, England
[5] Imperial Coll Healthcare NHS Trust, London, England
[6] Marymount Univ Hosp & Hosp, Curraheen, Ireland
[7] Cork Univ Hosp, Cork, Ireland
[8] Univ Coll Cork, Coll Med & Hlth, Cork, Ireland
[9] La Maddalena Canc Ctr, Pain Relief & Support Care, Palermo, Italy
[10] Univ Maribor, Inst Palliat Med & Care, Fac Med, Maribor, Slovenia
[11] Radboud Univ Nijmegen, Med Ctr, Dept Anesthesiol Pain & Palliat Med, Nijmegen, Netherlands
[12] GFO Hosp Bonn, Dept Anesthesiol Intens Med Pain Palliat Med, Ctr Pain Med, Bonn, Germany
[13] Univ Bonn, Bonn, Germany
[14] European Pain Federat, Brussels, Belgium
[15] Katholieke Univ Leuven, Univ Hosp Leuven, Leuven Ctr Algol & Pain Management, Leuven, Belgium